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WATER INGRESS IN GAS TURBINES FOR MANUFACTURING APPLICATION


CONTRIBUTING RE.ENGINEER

Sanya Mathura of Strategic Reliability Solutions Ltd


CHALLENGE

Dangerously high levels of water ingress noticed in one particular train (series of 6 GE Frame 5 Gas turbines).


Here's some background information: This particular facility produces liquefied natural gas and has 4 trains each consisting of 6 or 7 GE Frame 5 turbines. Each train was commissioned separately and are treated as separate units with differing dates for end of service life. For Train A, during a routinely scheduled oil change, the baseline results (after the new oil was filled in the sump) was determined to contain dangerously high levels of water (in excess of 2274ppm in one instance) for all of the individual sumps. Since this was a new charge of oil of 10,000 gallons the oil could not be discarded and replaced easily.


SOLUTION

A vacuum dehydration unit was used to remove the excess levels of water. Since the entire train was down for maintenance, this was an opportune time to install the dehydration units in line with the sumps and have the oils circulated through the system to remove the water. Initially, samples were taken every 12 hours to monitor the levels of the water and every 24 hours to determine if any of the additives are being depleted and the presence of any